1-Amino-2-Naphthol-3,6-disulfonic acid sodium 1-Amino-2-naphthol-3,6-disulfonic acid disodium salt 1-Amino-2-naphthol-3,6-disulfonic acid sodium salt 2,7-NAPHTHALENEDISULFONIC ACID, 4-AMINO-3-HYDROXY-, DISODIUM SALT 42579-07-7 Disodium 4-amino-3-hydroxy-2,7-naphthalenedisulfonate